javascript - Material UI Input 的焦点和不焦点时无法更改边框颜色

Question

我不知道为什么我不能让它工作。我选择 MuiInputBase-root元素，告诉它选择字段并将边框颜色设置为蓝色，并在焦点上将边框颜色设置为红色。我在这里做错了什么？

Codesandbox

import React from "react";
import "./styles.css";

import { makeStyles } from "@material-ui/core/styles";
import FormControl from "@material-ui/core/FormControl";
import OutlinedInput from "@material-ui/core/OutlinedInput";
import InputLabel from "@material-ui/core/InputLabel";

const useStyles = makeStyles(theme => ({
  root: {
    width: "20rem"
  },
  label: {
    background: "white",
    paddingRight: theme.spacing(0.5),
    "&.Mui-focused": {
      color: theme.palette.secondary.main
    }
  },
  closeIcon: {
    color: theme.palette.grey[400],
    "&.hidden": {
      display: "none"
    }
  },
  searchIcon: {
    color: theme.palette.primary.main
  }
}));

const useOutlinedInputStyles = makeStyles({
  root: {
    "& .MuiInputBase-root": {
      "& fieldset": {
        borderColor: "blue"
      },
      "&.Mui-focused fieldset": {
        borderColor: "red"
      }
    }
  }
});

export default function App() {
  const classes = useStyles();
  const outlinedInputStyles = useOutlinedInputStyles();
  return (
    <div className="App">
      <FormControl className={classes.root} variant="outlined">
        <InputLabel className={classes.label} htmlFor="search-input">
          placeholder
        </InputLabel>
        <OutlinedInput
          classes={outlinedInputStyles}
          id="search-input"
          labelWidth={70}
        />
      </FormControl>
    </div>
  );
}

Answer 1

问题是 .MuiInputBase-root不是根元素(.MuiOutlinedInput-root 元素)的子元素，它实际上是完全相同的元素，因此不需要该层。此外，类型选择器(例如 fieldset )具有 lower specificity比类选择器，所以 &.Mui-focused fieldset没有足够的特异性覆盖 default focused styles .而不是 fieldset你可以使用类选择器.MuiOutlinedInput-notchedOutline .

所以而不是:

root: {
  "& .MuiInputBase-root": {
    "& fieldset": {
      borderColor: "blue"
    },
    "&.Mui-focused fieldset": {
      borderColor: "red"
    }
  }
}

你应该有:

  root: {
    "& .MuiOutlinedInput-notchedOutline": {
      borderColor: "blue"
    },
    "&.Mui-focused .MuiOutlinedInput-notchedOutline": {
      borderColor: "red"
    }
  }

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